Anthraquinone dyestuffs



Patented Feb. 23, 1954 AN THRAQUINON E DEESTUF-FS' .Klaus Weinand, Leverk-usen, to Farbenfabriken Bayer Leverkusen, many Germany, .assignor Aktiengesllsc'haft',

Germany, a corporation of Ger- No Drawing. ApplicationAugust 26,1950. Serial No..1.81,17(l'3 Elaims priority, application Great Britain September 1, 1949- 6 Claims.

The present inventionrelates to new anthraquinone dyestuffs.

For dyeing union fabrics of wool and cellulose fibre with acid wool dyestufis it is required that such dyestuifs will dye wool also from the neutral bath. Only a few blue acid wool dyestuffs are known which-yield intense and fast dyeings on wool without the/addition of acids to the bath.

It is the object of the present invention to provide new dyestufis which may be utilized for dyeing wool from-theneutral bath.

A further object of the invention'is to provide new dyestufis which are superior to thehitherto known dyestufis in their'zaztfi-nity tothe fibre from neutral baths.

According to the present invention blue dyestuifs capable of being sufficiently absorbed from the neutral bath are obtained by reacting 1- amino 4-bromo-anthraquinone-2-sulfonic acid with amines of-the following composition:

wherein X represents alkoxy', carbalkoxy, sulfodialkyl am id'e, or sulfophenoxy, for instance methoxy,.-iethoxy, oarbmethoxy, carbethoxy, sulfodimethyl-amide, sulfodiethyl-amide. These groups promote: a zsuificient' solubility of the dyestufls and theirtabsorption-ifrom-.-the neutral bath.

The amines used in the manufacture of the new dyestuffs are produced by reacting nitroanil-in'es with-the corresponding benzoie chlorid'es, 'or by "reacting nitrobenzoyl "chlorides with the-correspondihgafliline-derivatives and subsequently reducing-t-he nitro compounds'in-the usual'manner. Reaction of the amines with the 1-amino-4- bromo-anthraquinone-2-su1fonic acid is performed in aqueous or alcoholic-aqueous media according to known methods. A modification of the process consists in condensing l-amino-i-bromoanthraquinone-2-sulfonic acid first with a diamino-benzene and reacting the dyestufis thus formed with the corresponding substituted benzoyl chloride.

The .new ayestuns of the present invention have the formula:

10 parts of "the sodiumsalt 10f 1-amino-4-bromoanthraquincne-fl-sulfonic acid,

20 parts of l-amino 3-(4-methoxy-benzoyl- .amino) -.benzene,

I5 parts .ofsodiumbicarbonate,

1 part of .cuprous chloride .aretboiled under reflux .in-.amixture .of-

parts .of water and 40 parts of ethyl alcohol while stirring until test portions show that the intensity and brightness of the blue solution formed does not further increase.

On cooling the dyestufi precipitates in crystals.

It is sucked ofi and purified byidi-ssolving in water, filtering and salting out.

The dry dyestuif is a blue powder which dissolves in water with a clear .blue coloration. It dyes wool-'fromthe neutral bath in intense clear, blue shades, whiclrarefast'to light and milling.

The same idyestufi is obtained by reacting the condensation" product of l-amino-i-bromo-anthraquinone-Q-sulfonic acid and Lii-dianfino- "benzene with 4-meth'oxy-benzoyl -clilonidei When using for the manufacture oi -'thetlyestufi instead of the meta-compound the analogous para-compound a dyestufl of green shade and otherwise the same properties is obtained.

Example 2 1 amino 4-bromo-anthraquinone-2-sulfon ic acid and 1.-(3'-amino-benzoyl-amino) -benzene- 3-sulfo-dimethylamide are reacted under the conditions and in the quantities indicated in Example 1. A dyestuff is obtained which compared with the dyestufi of Example 1 dyes wool from a neutral bath in more reddish blue shades having the same properties.

Example 3 10 parts of 1-amino-4-bromo-anthraquinone-2- sulfonic acid,

20 parts of 1-(3'-amino-benzoylamino) -4-carbmethoxy-benzene,

15 parts of sodium bicarbonate and 1 part of cuprous bromide are boiled in a mixture of 150 parts of water and 50 parts of ethyl alcohol for 3 to 4 hours under reflux with stirring.

After completion of the reaction the mixture is cooled, the dyestufi formed precipitating thereby is sucked off and purified by recrystallization from water. The dyestufi dissolves in water with reddish blue coloration. Wool is dyed from the neutral bath in clear blue shades.

Example 4 n following the procedure of Example 3, however, replacing the l-(3-amino-benzoylamino) -4-carbmethoxy-benzene by the same amount of l-(3-amino-benzoy1amino) -3-sulf0- phenoxy-benzene a blue dyestufi dyeing wool from the neutral bath in blue shades is obtained. The dyeing is distinguished by very good fastness to fulling.

I claim:

1. The new dyestufis of the general formula C) BITE:

wherein X is a radical selected from the group consisting of alkoxy, carbalkoxy, sulfo-dialkylamide and sulfophenoxy, and Z is a member of the group consisting of CO.NH and -NI-I.CO.

2. The new dyestufi of the formula (I) NH:

wherein X is a radical selected from the group consisting of alkoxy, carbalkoxy, sulfo-dialkylamide and sulfophenoxy.

4 3. The new dyestufi of the formula 0 NH: II I Vii wherein X is a radical selected from the group consisting of alkoxy, carbalkoxy, sulfo-dialkylamide and sulfophenoxy.

4. The new dyestufi of the formula 0 NH: I

SOaH

l l 0 lift CO.NH-C -O on:

5. The new dyestufi of the formula 0 NH: 11 I SO:H

NBLCOOO CH;

6. The new dyestuff of the formula 

1. THE NEW DYESTUFFS OF THE GENERAL FORMULA 